Overview: Dual 3+1 PWM Controller with Current Monitor for IMVP-7/VR12™ CPUs ISL95839
The ISL95839 Pulse Width Modulation (PWM) controller IC provides a plete solution for IMVP-7/VR12™ pliant microprocessor and graphic processor core power supplies. It provides the control and protection for two Voltage Regulators (VRs). The first VR, typical for Vcore, incorporates 2 integrated drivers and can operate in 3-, 2- or 1-phase configurations. The second VR, typical for Graphics, incorporates 1 integrated driver. The two VRs share a serial control bus to municate with the CPU and achieve lower cost and smaller board area pared with the two-chip approach.
Both VRs utilize Intersil’s Robust Ripple Regulator R3 Technology™. The R3 modulator has numerous advantages pared to traditional modulators, including faster transient response, variable switching frequency during load transients, and improved light load efficiency due to its ability to automatically change switching frequency.
